The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1978
Filed:
Dec. 13, 1976
Applicant:
Inventor:
Makoto Anzai, Yokosuka, JP;
Assignee:
Nissan Motor Company, Limited, Yokohama, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
1231 / ; 123 / ; 73 23 ; 2041 / ;
Abstract
A feedback control system for controlling the air/fuel ratio of a combustible mixture fed to an internal combustion engine based on the output of an exhaust sensor includes an input circuit of a high input impedance, which serves as a prefatory circuit to a control signal producing circuit to match the high internal impedance of the sensor at low exhaust gas temperatures. The input circuit has an operational amplifier with its noninverting input terminal connected to the sensor and, optionally, two or more switchable resistors to adjust the input impedance.